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Features

• Stand-up whole body counter
• Low background steel personnel shield
• 5 cm thick lead detector shield
• Scanning detector mechanism for linear geometry
• Accomodates up to two germanium detectors
• Includes ABACOS software for control and analysis

Description

The ACCUSCAN-II is a high resolution, stand-up whole body counter. It is designed to identify and quantify radionuclides with energies between 100 keV and 1336 keV in complicated combinations. The ACCUSCAN-II also provides information on the location of the radioactive materials found in the body through its scanning mechanism and the system§s ABACOS software.

These features make the ACCUSCAN-II an ideal companion to complement the FASTSCAN for large facilities like nuclear power plants. In this case the FASTSCAN can be used for routine monitoring and the ACCUSCAN-II can be used to investigate radioactivity found during routine counts and to provide information on the location of the radioactivity in the body. The ACCUSCAN-II also makes an excellent stand-alone product for smaller facilities that have a wider range of radionuclides to monitor for, and a smaller number of people to count on a routine basis.

The standard ACCUSCAN-II System includes a shield and scanning detector mechanism, a 25% coaxial germanium detector and cryostat assembly, a digital spectrum analyzer, as well as CANBERRA§s ABACOS whole body counting and Genie spectroscopy software packages. This turnkey system also includes complete factory integration and calibration, as well as training. A complete CANBERRA proposal will also include installation services by a CANBERRA Field Service Engineer or authorized representative.

CANBERRA also offers a second detector option for the standard ACCUSCAN II System. The standard second detector option includes a 25% coaxial germanium detector with a cryostat, a digital signal processor, an all-in-one cable assembly and the second detector holder for the scanning mechanism. Adding a second detector allows for shorter counting times and improved detection limits.

The ACCUSCAN-II uses a shadow shield to shield against elevated ambient background. The system§s shadow shield is composed of two major assemblies, a low background steel personnel enclosure and a scanning tower assembly with a lead detector shield assembly. The personnel shield or enclosure provides shielding from the back and sides of the person and the lead detector shadow shield shields the detectors from the front.

The personnel shield is fabricated with a full 10 cm (4 in.) of low background steel. This low background steel is manufactured with a special cobalt free process. This process guarantees steel free of the ⁶⁰Co contamination normally found in steel, an important consideration in monitoring personnel for fission product contamination. The shield assembly also includes plastic liners designed to make decontamination fast and easy.

The ACCUSCAN II includes a scanning detector assembly with the lead shadow. The lead detector shield is attached to scanning mechanism, which is operated through the systems controller. The ACCUSCAN II§s detector shield provides 5 cm (2 in.) lead around the detector and includes a copper liner to reduce the effect of lead X-rays. CANBERRA can also provide an optional detector cryostat that includes lead shielding between the detector and the Dewar.

System Operation

The subject enters the ACCUSCAN II shield assembly and stands against the back wall. There are molded positioning devices on the back wall that make it natural for the subject to stand in the correct location. The operator starts the count using the ABACOS software included with the system. The software starts the data collection and brings up a subject demographics screen. The operator fills in a brief demographics screen about the count (subject name, ID number, reason for count, etc.). The rest is completely automatic. The ABACOS software displays the spectral data during the acquisition. It stops the count when the pre-programmed count time has elapsed, it stores the data, analyzes the spectral data and reports the results. Once the reporting phase of the count is completed ABACOS automatically resets the system for the next count. Count times are normally in the 8-15 minute range for a single detector system and in the 5-10 minute range for a two-detector system.